Efficacy of CIDR or FGA Sponges with hCG Treatments on the Conception Rate and Prolificacyin Lori Ewes Out of the Breeding Season
الموضوعات :M.M. Moeini 1 , F. Alipour 2 , M.R. Sanjabi 3
1 - College of Agriculture, Razi University, Kermanshah, Iran
2 - College of Agriculture, Razi University, Kermanshah, Iran
3 - Department of Animal Science, Iranian Research Organization Science and Technology, Tehran, Iran
الکلمات المفتاحية: estrus synchronization, conception, HCG, Lori ewes,
ملخص المقالة :
Two experiments were performed to determine the effectiveness of different progestogens contained in intravaginal devices, different doses of eCG and subsequent hCG treatment on the reproductive performance of estrus-induced mature Lori ewes. In the first experiment, 88 ewes were allocated into two groups, and were treated with either fluorogestone acetate (FGA) sponges or Controlled Internal Drug Release devices (CIDR).The sponges were withdrawn 13 days after insertion and then ewes were treated with either 350 IU or 500 IU of eCG by intramuscular injection. There was no significant difference among treatments in the percentage of ewes in estrus or the interval to the onset of estrus. However, the conception rate and prolificacy of ewes treated with 350 IU eCG, in both the FGA and CIDR groups, was higher than ewes treated with 500 IU of eCG. In the second experiment 384 ewes were randomly divided into three groups and after synchronization with FGA spongesand 350 IU of eCG, 128 ewes in the first group (T1) were injected 250 IU hCG when artificially inseminated, 128 ewes in the second group (T2) were injected 250 IU hCG 12 days after AI and the 128 ewes in the third group (C) acted as the control group. Estrous was determined by monitoring 35 teaser rams to calculate estrous rate. Prolificacy and conception rate were assessed and serum progesterone (P4) concentrations were measured on days 12, 14 and 16 days after AI. Prolificacy was increased in the T1 group compared with control group (P<0.05) and conception rates were higher in hCG treatments (P<0.05). The weight of single lambs on the day ofbirth increased with the hCG injection on days 0 and 12 (P<0.05). The P4 concentration was higher in the hCG-treated groups compared with the control ewes on day 16 (P<0.05). It is concluded that CIDR and FGA sponges were equally effective for estrous induction in anestrous Lori ewes and P4 concentrations increased with 200 IU hCG given at the time of AI or 12 days after AI which could improve reproductive performance.
AllisonA.J. and Robinson T.J. (1970). The effect of dose level of intravaginal progestagen on sperm transport, fertilization 350 IU of eCG n and lambing in the cyclic Merino ewe.J. Reprod. Fertil. 22, 515-531.
AshworthC.J., Sales D.I. and Wilmut I.(1989). Evidence of an association between the survival of embryos and periovulatory plasma progesterone concentration in the ewe. J. Reprod. Fertil. 87, 23-32.
AtamanM.B., Akoz M. and Akman O.) 2006). Induction of synchronized oestrus in akkaraman cross-bred ewes during breeding and anestrus seasons : the use of short-term and long-term progesterone treatments.Rev. Med. Vet. 5, 257-260.
AtsanT., Emsen E., Yaprak M., Dagdemir V. and Diaz C.A.G.(2007). An economic assessment of differently managed sheep flocks in eastern Turkey. Ital. J. Anim. Sci. 6, 407-414.
BeckN.F.G., Green A., Khan T.H. and Khalid M. (1998). The effects of buserelin (GnRH analogue) or hCG treatment on luteal weight and embryonic development during early pregnancy in the ewe. J. Reprod. Fertil. Abstr. Ser. 21, 95-96.
CamM.A., Kuran M., Yildiz S. and Selcuk E. (2002). Fetal growth and reproductive performance in ewes administered GnRH agonist on day 12 post-mating. Anim. Reprod. Sci. 72, 73-82.
Cam M.A. and Kuran M. (2003). Effects of a single injection of hCG or GnRH agonist on day 12 post mating on fetal growth and reproductive performance of sheep. Anim. Reprod. Sci. Res. 80, 81-90.
DoganI. and Nur Z. (2006).Different estrous induction methods during the non-breeding season in Kivircik ewes. PolishVet. Med. 51(4), 133-138.
FukuiY., Itagaki R., Ishida N. and Okada M. (2001). Effect of different hCG treatments on fertility of estrus-induced and artificially inseminated ewes during the non-breeding season. J. Reprod. Dev. 47, 189-195.
GomezBrunet A., Santiago Moreno J., Montoro V., Garde J., Pons P., Gonzalez Bulnes A. and Opez Sebastian A.L. (2006). Reproductive performance and progesterone secretion in estrus-induced Manchega ewes treated with hCG at the time of AI. Small Rumen. Res. 71, 117-122.
IshidaN., Okada M., Sebata K., Minato M. and Fukui Y. (1999). Effects of GnRH and hCG treatment for enhancing corpus luteum function to increase lambing rate of ewes artificially inseminated during the non-breeding season. J. Reprod. Dev. 45, 73-79.
KhanT.H., Hastie P.M., Beck N.F.G. and Khalid M. (2003). hCG treatment on day of mating improves embryo viability and fertility in ewe lambs. Anim. Reprod. Sci. 76, 81-89.
KleemannD.O., Walker S.K. and Seamark R.F. (1994). Enhanced fetal growth in sheep administered progesterone during the first three days of pregnancy. J. Reprod. Fertil. 102, 411-417.
MoeiniM.M., Alipoor F. and Moghadam A.A. (2009). The effect of human chorionic gonadotropinon the reproduction per formance in Lori sheep synchronized with different doses of pregnant mare serum gonadotrophin outside the breeding season. Asian J. Anim. Vet. Adv. 4(1), 9-15.
NephewK.P., C´ardenas H., Mc Clure K.E., Ott T.L. Bazer F.W. and Pope W.F. (1994). Effects of administration of human gonadotropin or progesterone before maternal recognition of pregnancy on blastocyst development and pregnancy in sheep. J. Anim. Sci. 72, 453-458.
RusselA.J.F., Doney J.M. and Gunn R.G. (1969). Subjective assessment of moderate levels of bodycondition. Anim. Reprod. Sci. 24, 119-126.
ThatcherW.W., Moreira F., Santos J.E.P., Mattos R.C., Lopes F.L., Pancarci S.M. and Risco C.A. (2001). Effects of hormonal treatments on reproductive performance and embryo production. Theriogenology. 55, 75-89.
UngerfeldR. and Rubianes E. (1999). Effectiveness of short-term progestogen primings for the induction of fertile oestrus with eCG in ewes during late seasonal anoestrus. Anim. Sci. 68, 349-353.
UngerfeldR., Suárez G., Gómez G. and Rubianes E. (2000). Respuesta a la introduccion de carneros en ovejas corriedale en anestro estacional pretratadas con diferentes cantidades de medroxiprogesterona (response of Corriedale ewes primed with different amounts of medroxyprogesterone to the introduction of rams during seasonal anestrus), Pp. 28-31 in Proc. 16th Conf. Reunión Lat. Prod. Anim. March. Montevideo, Uruguay.
ViñolesC., Meikle A., Forsberg M. and Rubianes E. (1999). The effect of subluteal levels of exogenous progesterone on follicular dynamics and endocrine patterns during the early luteal phase of the ewe. Theriogenology. 51, 1351-1361.
Zare Shahneh A., Deldar Tajangookeh H., Sadeghipanah H. and Saki A.A. (2006). Effect of controlled internal drug release device treatment duration and eCG dose on reproductive performance of seasonally anestrous fat-tailed Iranian ewes. Pakistan. J. Biol. Sci. 9, 1552-1555.
ZonturluA.K., Aral F., Ozyurtlu N. and Yavuzer U. (2008). Syncronization of estrous using FGA and CIDR intervaginal pessaries during the transition period in Awassi ewes. J. Anim. Vet. Adv. 7(9), 1093-1096.
